Theresa May has now signed a letter to trigger Article 50, the start of the official process to leave the EU.
Kevin Spacey's Replacement Announced
The former stage Director of the hit musical Matilda is taking over as the Artistic Director of The Old Vic Theatre.
Kevin Spacey is stepping down after a decade in charge.
Matthew Warchus will take up the role in autumn next year.
He has mounted more than 70 productions in London and on Broadway.
Kevin Spacey said: "I couldn't be happier that my friend Matthew Warchus has agreed to take the reins at the Old Vic next year.
"Matthew is a thoughtful, intuitive and highly creative director and he has rightly been applauded for his work, in particular the quality and diversity of his portfolio.
"I know he loves our theatre and I am delighted for our staff, our audiences and for our acting and production communities that he will be its next guardian."
Warchus - whose film Pride, about a group of gay activists supporting striking miners in 1984, is released in September - said: "I am excited and honoured to be following Kevin's galvanising tenure at this wonderful building. He has re-established the Old Vic as a globally important theatre and I look forward to continuing to develop it as a hub of invigorating creativity."
Spacey opens in his one-man show Clarence Darrow at the Old Vic next week.
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